More gimp tutorials on layer modes:
How to make a Zombie Using Gimp.
My gimp zombie tutorial is an extensive lesson that uses several layer modes using both textures and simple colors.How to use Gimp to convert color to black and white (selective Colorization):
This is the lesson that I talked about in the gimp video tutorial above when I mentioned selective colorization.How To Make The Girl Cold and Scary Using Gimp.
A lot of this gimp tutorial focuses on using layer modes to modify eyes.Photo Touch Up Using Gimp 101.
This Gimp tutorial talks about how layer modes can be used in a more practical fashion to enhance your images.<<<Lesson 5 - Layer Masks